C00A3

Driveline Control Module Rear Differential Unit A Control Circuit Driver

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check engine light comes on
Reduced all-wheel drive efficiency
Unusual noises from the rear of the car
Handling problems on slippery roads

Causes

Open or short circuit in wiring harness
Differential solenoid valve malfunction
Damage to the rear differential control module
Poor contact in connectors
Power or grounding problems

How to Fix

Check wiring harness for damage
Check the resistance and operation of the solenoid valve
Inspect connectors for corrosion or damage
Check circuit power and grounding
If necessary, replace the differential control module

Related codes

C00A4 C00A5 C0040